PPARδ is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-03-28. Where a claim depends on a specific study, the study is described rather than over-claimed.
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
GW501516 acts on PPARδ, a nuclear receptor that helps regulate fatty acid oxidation and energy homeostasis. In animal studies, activation of this receptor was associated with increased endurance and changes in lipid metabolism. Human trials examined effects on blood lipids and other metabolic markers, but the compound did not advance to approval. Rodent studies later reported tumors in multiple tissues at doses used in those experiments. Whether those findings translate to human risk remains uncertain, and the clinical relevance of the animal data is still debated.
Regulatory bodies treat GW501516 as a prohibited substance in competitive sport. The World Anti-Doping Agency added it to the prohibited list, and it falls under classes covering metabolic modulators and hormone-related agents. It is not approved by drug regulators for human use, and it is not a lawful dietary supplement. Products sold under the cardarine name may contain unlisted ingredients or different compounds. Because no approved product exists, quality and identity are not guaranteed by pharmaceutical manufacturing standards.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white solid | Typical form of reference material |
| Solubility | Low in water; soluble in DMSO | Used to prepare stock solutions |
| Typical storage | -20 °C, desiccated, protected from light | Common laboratory practice |
| Analytical method | LC-MS/MS | Detects parent compound and metabolites |
| Common test matrix | Urine or blood | Used in anti-doping analysis |
Cardarine is a common name for GW501516, a synthetic compound developed in the 1990s through research collaborations involving GlaxoSmithKline. It belongs to a class of molecules known as peroxisome proliferator-activated receptor delta agonists. Early studies explored its effects on lipid metabolism and energy expenditure in animal models. The compound was never approved as a human medicine, and clinical development was discontinued. In the years since, it has appeared in fitness and bodybuilding communities as a performance-enhancing substance. Regulatory agencies classify it as an unapproved drug.
PPARδ is a nuclear receptor that regulates gene expression related to fatty acid oxidation, glucose homeostasis, and mitochondrial function. GW501516 binds to this receptor with high affinity and activates downstream signaling in skeletal muscle and other tissues. Animal studies reported increased endurance and altered fuel preference, but human data remain limited and inconsistent. The precise relationship between receptor activation and observed physiological changes is still an area of active investigation. Researchers have also examined whether the compound affects inflammation or cell proliferation. No approved therapeutic indication exists for cardarine.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
=== Board members and trustees === On January 5, 2017, the board of trustees announced the selection of Rajiv Shah to serve as the 13th president of the foundation. Shah became the youngest person, at 43, and first Indian-American to serve as president of the foundation. He assumed the position March 1, succeeding Judith Rodin who served as president for nearly twelve years and announced her retirement, at age 71, in June 2016. A former president of the University of Pennsylvania, Rodin was the first woman to head the foundation. Rodin in turn had succeeded Gordon Conway in 2005. Current staff as of June 1, 2021 include:
meiosis A specialized type of cell division that occurs exclusively in sexually reproducing eukaryotes, during which DNA replication is followed by two consecutive rounds of division to ultimately produce four genetically unique haploid daughter cells, each with half the number of chromosomes as the original diploid parent cell. Meiosis only occurs in cells of the sex organs, and serves the purpose of generating haploid gametes such as sperm, eggs, or spores, which are later fused during fertilization. The two meiotic divisions, known as Meiosis I and Meiosis II, may also include various genetic recombination events between homologous chromosomes.
=== Fluorochemical manufacturing workers === People who work at fluorochemical production plants and in manufacturing industries that use PFAS in the industrial process can be exposed to PFAS in the workplace. Much of what we know about PFAS exposure and health effects began with medical surveillance studies of workers exposed to PFAS at fluorochemical production facilities. These studies began in the 1940s and were conducted primarily at U.S. and European manufacturing sites. Between the 1940s and 2000s, thousands of workers exposed to PFAS participated in research studies that advanced scientific understanding of exposure pathways, toxicokinetic properties, and adverse health effects associated with exposure. The first research study to report elevated organic fluorine levels in the blood of fluorochemical workers was published in 1980. It established inhalation as a potential route of occupational PFAS exposure by reporting measurable levels of organic fluorine in air samples at the facility. Workers at fluorochemical production facilities have higher levels of PFOA and PFOS in their blood than the general population. Serum PFOA levels in fluorochemical workers are generally below 20,000 ng/mL but have been reported as high as 100,000 ng/mL, whereas the mean PFOA concentration among non-occupationally exposed cohorts in the same time frame was 4.9 ng/mL. Among fluorochemical workers, those with direct contact with PFAS have higher PFAS concentrations in their blood than those with intermittent contact or no direct PFAS contact.
Sources: en.wikipedia.org
The alternative to selling wholesale to distributors or retailers is to sell to retail customers either through company-owned stores or online. Advantages include receiving a larger slice of the price paid by the consumer; disadvantages include difficulty in reaching consumers. Direct selling is usually discussed as a model where products are sold through person-to-person selling outside a fixed retail establishment. The U.S. FTC uses this "outside a retail establishment" framing in its business guidance materials regarding multi level marketing.
Freeze-casting, also frequently referred to as ice-templating, is a technique that exploits the highly anisotropic solidification behavior of a solvent (often, but not exclusively, water) in a well-dispersed solution or slurry to controllably template directionally porous ceramics, polymers, metals and their hybrids. By subjecting a slurry to a directional temperature gradient, ice crystals will nucleate on one side and grow along the temperature gradient. The ice crystals will redistribute the dissolved substance and the suspended particles as they grow within the slurry, effectively templating the ingredients that are distributed in the slurry. Once solidification has ended, the frozen, templated composite is placed into a freeze-dryer to remove the ice. The resulting green body contains anisotropic macropores in a replica of the sublimated ice crystals and structures from micropores to nacre-like packing between the ceramic or metal particles in the walls. The walls templated by the morphology of the ice crystals often show unilateral features. These together build a hierarchically structured cellular structure. This structure is often sintered for metals and ceramics, and crosslinked for polymers, to consolidate the particulate walls and provide strength to the porous material. The porosity left by the sublimation of solidified fluid is typically between 2–200 μm.
==== Complex IV ==== In Complex IV (cytochrome c oxidase; EC 7.1.1.9), sometimes called cytochrome AA3, four electrons are removed from four molecules of cytochrome c and transferred to molecular oxygen (O2) and four protons, producing two molecules of water. The complex contains coordinated copper ions and several heme groups. At the same time, eight protons are removed from the mitochondrial matrix (although only four are translocated across the membrane), contributing to the proton gradient. The exact details of proton pumping in Complex IV are still under study. Cyanide is an inhibitor of Complex IV.
Sources: en.wikipedia.org
For services to Broadcasting and to Charity. Jacqueline Blake. Lately Chair, LACA, The Food People. For services to Education. Christopher John Blandford. President, World Heritage UK. For services to World Heritage. Heather Jane Boardman. Adviser, British Fashion Council and Founder, British Beauty Council. For voluntary services to Fashion and Beauty. Professor Daniela Bortoletto. Head of Particle Physics, University of Oxford. For services to Particle Physics and to Gender Equality. Camilla Jane Bowry. Founder and Chief Executive Officer, Sal's Shoes. For services to Young People, to Education and to the Environment. Michael Andrew Boyd. Project Manager, Northern Ireland Human Rights Commission, Consultant Director for Northern Ireland, Rio Ferdinand Foundation, Chair, Belfast Healthy City and lately Director, Football Development, Irish Football Association. For services to Association Football, to Sport, to Charity and to Reconciliation in Northern Ireland. Eamonn John Boylan. Chief Executive, Greater Manchester Combined Authority. For services to Local Government. Anthony James Bravo. Principal, Basingstoke College of Technology. For services to Further Education. Dr. Stephen Brierley. Founder, Riverlane. For services to Quantum Computing. Millie Bright. Footballer. For services to Association Football. Professor Matthew Jon Brookes. Professor of Physics, University of Nottingham. For services to Physics. Abigail Margaret Brown. Councillor and lately Leader, Stoke-on-Trent City Council, and Deputy Chair, Local Government Association. For services to Local Government.
== CLIA identification number == CLIA identification numbers are 10-digit alphanumeric unique identifiers issued by the CLIA data system to identify a CLIA laboratory. This is assigned at the time of initial entry of the CLIA application and included with the mailing of the remittance fee coupon.
=== Processing === The final peptide is often modified, e.g., by glycosylation, acylation, halogenation, or hydroxylation. The responsible enzymes are usually associated to the synthetase complex and their genes are organized in the same operons or gene clusters.
Sources: en.wikipedia.org
Anti-doping and clinical laboratories commonly use liquid chromatography-tandem mass spectrometry. The method can identify GW501516 and its metabolites in urine or blood. Detection depends on sample timing and the amount present.
PPARδ is a nuclear receptor that regulates genes linked to fatty acid oxidation and energy metabolism. Activation can alter lipid handling and energy use in experimental models. The full range of effects in humans is still under study.
The solid compound is generally stable when kept cold, dry, and protected from light. Solutions may degrade faster, so laboratory protocols often specify fresh preparation or cold storage. Stability can depend on solvent, concentration, and container.
No. Cardarine is a PPARδ agonist, while selective androgen receptor modulators act on androgen receptors. The two classes differ in receptor target and downstream effects.